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joshkitt/jvm-notes.txt

Last active July 21, 2021 16:58
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JVM Memory
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jvm-notes.txt
Maximum heap size:
If physical memory size is up to 192 megabytes (MB) then default maximum heap size is half of the physical memory.
If physical memory size is more than 192 megabytes then default maximum heap size is one fourth of the physical memory.
Initial heap size: At least 8 MB or 1/64th of physical memory up to a physical memory size of 1 GB.
java -XX:+PrintFlagsFinal -version | grep HeapSize
The default thread stack size varies with JVM, OS and environment variables.
java -XX:+PrintFlagsFinal -version | grep ThreadStackSize
JVM arguments (example)
-Xms2048m -Xmx4096m
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